{"id":37677,"date":"2025-05-16T22:01:02","date_gmt":"2025-05-16T14:01:02","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/37677.html"},"modified":"2025-05-16T22:01:02","modified_gmt":"2025-05-16T14:01:02","slug":"%e4%b8%80%e6%ac%a1%e5%9b%a0%e6%a0%a1%e6%97%b6%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%bc%82%e5%b8%b8%e5%bc%95%e8%b5%b7%e7%9a%84%e6%80%a7%e8%83%bd%e5%b7%ae%e5%bc%82%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/37677.html","title":{"rendered":"\u4e00\u6b21\u56e0\u6821\u65f6\u670d\u52a1\u5668\u5f02\u5e38\u5f15\u8d77\u7684\u6027\u80fd\u5dee\u5f02\u5206\u6790"},"content":{"rendered":"<\/p>\n<h4>\u4e00\u6b21\u56e0\u6821\u65f6\u670d\u52a1\u5668\u5f02\u5e38\u5f15\u8d77\u7684\u6027\u80fd\u5dee\u5f02\u5206\u6790<\/h4>\n<ul>\n<li>\u4e00.\u80cc\u666f\u77e5\u8bc6<\/li>\n<li>\n<ul>\n<li>1. **TSC \u9891\u7387**\uff1a\u786c\u4ef6\u7ea7\u9ad8\u7cbe\u5ea6\u8ba1\u65f6<\/li>\n<li>2. **gettimeofday**\uff1a\u7528\u6237\u6001\u65f6\u95f4\u63a5\u53e3<\/li>\n<li>3. **adjtimex**\uff1a\u7cfb\u7edf\u65f6\u949f\u7684\u8f6f\u4ef6\u6821\u51c6<\/li>\n<li>4. **`clock_adjtime(CLOCK_REALTIME, {modes=ADJ_TICK})`**: \u7528\u4e8e\u4fee\u6539\u7cfb\u7edf\u65f6\u949f\u4e2d\u65ad\u95f4\u9694\uff08`tick` \u503c\uff09\u3002<\/li>\n<li>5. \u5173\u7cfb<\/li>\n<li>6.\u5173\u952e\u7ed3\u8bba<\/li>\n<li>7.\u793a\u4f8b\u573a\u666f<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c.\u5b9e\u9a8c<\/li>\n<li>\n<ul>\n<li>1.\u7528\u6709\u95ee\u9898\u7684NTP\u670d\u52a1\u5668\u6a21\u62df<\/li>\n<li>2.\u901a\u8fc7`adjtimex`\u6d4b\u8bd5\u4e0d\u540c`tick`\u5bf9\u8ba1\u65f6\u7684\u5f71\u54cd<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u4e00.\u80cc\u666f\u77e5\u8bc6<\/h2>\n<h3>1. TSC \u9891\u7387\uff1a\u786c\u4ef6\u7ea7\u9ad8\u7cbe\u5ea6\u8ba1\u65f6<\/h3>\n<ul>\n<li>TSC\uff08Time Stamp Counter\uff09 \u662f CPU \u63d0\u4f9b\u7684\u786c\u4ef6\u8ba1\u6570\u5668\uff0c\u5176\u9891\u7387\u76f4\u63a5\u7531 CPU \u65f6\u949f\u51b3\u5b9a\uff08\u4f8b\u5982 3 GHz \u7684 CPU\uff0cTSC \u6bcf\u79d2\u9012\u589e\u7ea6 3\u00d710\u2079 \u6b21\uff09\u3002<\/li>\n<li>\u7cbe\u5ea6\uff1aTSC \u7684\u9012\u589e\u9891\u7387\u51b3\u5b9a\u4e86\u786c\u4ef6\u5c42\u9762\u7684\u6700\u5c0f\u65f6\u95f4\u5206\u8fa8\u7387\u3002\u4f8b\u5982\uff0c3 GHz \u7684 TSC \u7406\u8bba\u4e0a\u53ef\u63d0\u4f9b\u7ea6 0.33 \u7eb3\u79d2\u7684\u5206\u8fa8\u7387\u3002<\/li>\n<li>\u95ee\u9898\uff1aTSC \u7684\u7edd\u5bf9\u51c6\u786e\u6027\u4f9d\u8d56\u4e8e CPU \u65f6\u949f\u7684\u7a33\u5b9a\u6027\u3002\u82e5 CPU \u9891\u7387\u52a8\u6001\u8c03\u6574\uff08\u5982\u8282\u80fd\u6a21\u5f0f\uff09\uff0c\u65e7 CPU \u7684 TSC \u53ef\u80fd\u6f02\u79fb\uff1b\u73b0\u4ee3 CPU \u901a\u5e38\u652f\u6301\u6052\u5b9a TSC\uff08constant_tsc\uff09\uff0c\u786e\u4fdd\u9891\u7387\u56fa\u5b9a\u3002<\/li>\n<\/ul>\n<hr>\n<h3>2. gettimeofday\uff1a\u7528\u6237\u6001\u65f6\u95f4\u63a5\u53e3<\/h3>\n<ul>\n<li>gettimeofday \u662f\u7cfb\u7edf\u8c03\u7528\uff0c\u8fd4\u56de\u5f53\u524d\u65f6\u95f4\uff08\u79d2 + \u5fae\u79d2\uff09\uff0c\u5176\u5e95\u5c42\u4f9d\u8d56\u5185\u6838\u7684\u65f6\u95f4\u6e90\uff08\u5982 TSC\uff09\u3002<\/li>\n<li>\u7cbe\u5ea6\uff1a\n<ul>\n<li>\u82e5\u5185\u6838\u4f7f\u7528 TSC \u4f5c\u4e3a\u65f6\u95f4\u6e90\uff08\u901a\u8fc7 clocksource=tsc \u914d\u7f6e\uff09\uff0cgettimeofday \u7684\u7cbe\u5ea6\u76f4\u63a5\u7531 TSC \u9891\u7387\u51b3\u5b9a\uff08\u5fae\u79d2\u7ea7\u63a5\u53e3\uff0c\u4f46\u5b9e\u9645\u5206\u8fa8\u7387\u53ef\u8fbe\u7eb3\u79d2\u7ea7\uff09\u3002<\/li>\n<li>\u5185\u6838\u4f1a\u5c06 TSC \u503c\u8f6c\u6362\u4e3a\u7cfb\u7edf\u65f6\u95f4\uff08\u901a\u8fc7\u6821\u51c6\u7684 TSC \u9891\u7387\uff09\uff0c\u56e0\u6b64 TSC \u7684\u6821\u51c6\u8bef\u5dee\u4f1a\u5f71\u54cd gettimeofday \u7684\u7edd\u5bf9\u65f6\u95f4\uff0c\u4f46\u77ed\u671f\u65f6\u95f4\u95f4\u9694\u7684\u6d4b\u91cf\u7cbe\u5ea6\u4ecd\u7531 TSC \u5206\u8fa8\u7387\u4fdd\u8bc1\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr>\n<h3>3. adjtimex\uff1a\u7cfb\u7edf\u65f6\u949f\u7684\u8f6f\u4ef6\u6821\u51c6<\/h3>\n<ul>\n<li>adjtimex \u7528\u4e8e\u8c03\u6574\u5185\u6838\u65f6\u949f\u7684\u9891\u7387\u8865\u507f\u548c\u65f6\u95f4\u504f\u79fb\uff0c\u901a\u5e38\u7531 NTP\uff08\u7f51\u7edc\u65f6\u95f4\u534f\u8bae\uff09\u8c03\u7528\uff0c\u4ee5\u7ea0\u6b63\u7cfb\u7edf\u65f6\u949f\u4e0e\u771f\u5b9e\u65f6\u95f4\u7684\u504f\u5dee\u3002<\/li>\n<li>\u4f5c\u7528\uff1a\n<ul>\n<li>\u5f53 TSC \u5b58\u5728\u5fae\u5c0f\u9891\u7387\u8bef\u5dee\uff08\u5982\u786c\u4ef6\u65f6\u949f\u7565\u5feb\u6216\u7565\u6162\uff09\u65f6\uff0cadjtimex \u4f1a\u4fee\u6539\u5185\u6838\u7684\u65f6\u949f\u9891\u7387\u8865\u507f\u53c2\u6570\uff08time_freq\uff09\uff0c\u4f7f\u7cfb\u7edf\u65f6\u95f4\u9010\u6e10\u4e0e\u771f\u5b9e\u65f6\u95f4\u540c\u6b65\u3002<\/li>\n<li>\u4f8b\u5982\uff0c\u82e5 TSC \u9891\u7387\u7684\u6821\u51c6\u503c\u6709 0.001% \u7684\u8bef\u5dee\uff0cadjtimex \u53ef\u901a\u8fc7\u8c03\u6574\u5185\u6838\u7684\u6362\u7b97\u7cfb\u6570\uff0c\u4fee\u6b63 gettimeofday \u8fd4\u56de\u7684\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr>\n<h3>4. clock_adjtime(CLOCK_REALTIME, {modes=ADJ_TICK}): \u7528\u4e8e\u4fee\u6539\u7cfb\u7edf\u65f6\u949f\u4e2d\u65ad\u95f4\u9694\uff08tick \u503c\uff09\u3002<\/h3>\n<ul>\n<li>CLOCK_REALTIME\uff1a\u7cfb\u7edf\u8303\u56f4\u7684\u5b9e\u65f6\u65f6\u949f\uff0c\u8868\u793a\u4ece Unix \u7eaa\u5143\uff081970-01-01 00:00:00 UTC\uff09\u5230\u5f53\u524d\u7684\u65f6\u95f4\u3002<\/li>\n<li>ADJ_TICK \u6a21\u5f0f\uff1a\u901a\u8fc7 clock_adjtime \u8c03\u6574\u65f6\u949f\u7684 tick \u53c2\u6570\uff0c\u5373\u6bcf\u4e2a\u65f6\u949f\u4e2d\u65ad\u7684\u65f6\u95f4\u95f4\u9694\uff08\u5355\u4f4d\uff1a\u5fae\u79d2\uff09\u3002\u9ed8\u8ba4\u503c\u901a\u5e38\u4e3a 10000\uff08\u5373 10 \u6beb\u79d2\uff09\u3002<\/li>\n<li>\u4f5c\u7528\uff1a\u4fee\u6539 tick \u503c\u4f1a\u5f71\u54cd\u65f6\u949f\u4e2d\u65ad\u7684\u9891\u7387\uff0c\u8fdb\u800c\u5f71\u54cd\u7cfb\u7edf\u65f6\u95f4\u7684\u66f4\u65b0\u7c92\u5ea6\u3002\u4f46\u9700\u8c28\u614e\u64cd\u4f5c\uff0c\u4e0d\u5f53\u7684 tick \u503c\u53ef\u80fd\u5bfc\u81f4\u7cfb\u7edf\u4e0d\u7a33\u5b9a\u3002<\/li>\n<\/ul>\n<hr>\n<h3>5. \u5173\u7cfb<\/h3>\n<table>\n<tr>\n   \u7ec4\u4ef6<br \/>\n   \u4f5c\u7528\u5c42\u7ea7<br \/>\n   \u5bf9\u65f6\u95f4\u7cbe\u5ea6\u7684\u5f71\u54cd<br \/>\n  <\/tr>\n<tbody>\n<tr>\n<td>TSC \u9891\u7387<\/td>\n<td>\u786c\u4ef6<\/td>\n<td>\u51b3\u5b9a\u77ed\u671f\u65f6\u95f4\u95f4\u9694\u7684\u6d4b\u91cf\u5206\u8fa8\u7387\uff08\u7eb3\u79d2\u7ea7\uff09\uff0c\u4f46\u4f9d\u8d56\u6821\u51c6\u548c\u7a33\u5b9a\u6027\u3002<\/td>\n<\/tr>\n<tr>\n<td>gettimeofday<\/td>\n<td>\u5185\u6838\/\u7528\u6237\u63a5\u53e3<\/td>\n<td>\u4f9d\u8d56 TSC \u7684\u5206\u8fa8\u7387\uff0c\u4f46\u53d7\u5185\u6838\u6821\u51c6\uff08\u5305\u62ec adjtimex \u8c03\u6574\uff09\u5f71\u54cd\u7edd\u5bf9\u65f6\u95f4\u51c6\u786e\u6027\u3002<\/td>\n<\/tr>\n<tr>\n<td>adjtimex<\/td>\n<td>\u8f6f\u4ef6\u6821\u51c6<\/td>\n<td>\u4fee\u6b63 TSC \u9891\u7387\u7684\u957f\u671f\u8bef\u5dee\uff0c\u786e\u4fdd gettimeofday \u8fd4\u56de\u7684\u65f6\u95f4\u4e0e\u771f\u5b9e\u4e16\u754c\u65f6\u95f4\u540c\u6b65\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr>\n<h3>6.\u5173\u952e\u7ed3\u8bba<\/h3>\n<li>\n<p>\u77ed\u671f\u7cbe\u5ea6\uff1a gettimeofday \u7684\u65f6\u95f4\u95f4\u9694\u6d4b\u91cf\u7cbe\u5ea6\uff08\u5982\u8ba1\u7b97\u4e24\u6b21\u8c03\u7528\u7684\u5dee\u503c\uff09\u7531 TSC \u7684\u5206\u8fa8\u7387\u51b3\u5b9a\uff0c\u53ef\u8fbe\u7eb3\u79d2\u7ea7\uff08\u4f46\u63a5\u53e3\u8fd4\u56de\u5fae\u79d2\u7ea7\uff09\u3002<\/p>\n<\/li>\n<li>\n<p>\u957f\u671f\u51c6\u786e\u6027\uff1a TSC \u7684\u786c\u4ef6\u9891\u7387\u53ef\u80fd\u5b58\u5728\u5fae\u5c0f\u8bef\u5dee\uff08\u5982\u6e29\u5ea6\u6f02\u79fb\uff09\uff0c\u9700\u901a\u8fc7 adjtimex\uff08\u6216 NTP\uff09\u52a8\u6001\u8c03\u6574\u5185\u6838\u7684\u65f6\u949f\u8865\u507f\u53c2\u6570\uff0c\u786e\u4fdd\u7cfb\u7edf\u65f6\u95f4\u4e0e\u771f\u5b9e\u65f6\u95f4\u957f\u671f\u4e00\u81f4\u3002<\/p>\n<\/li>\n<li>\n<p>\u6821\u51c6\u4f9d\u8d56\uff1a \u5185\u6838\u542f\u52a8\u65f6\u4f1a\u6821\u51c6 TSC \u9891\u7387\uff08\u5982\u901a\u8fc7\u53c2\u8003\u5176\u4ed6\u65f6\u949f\u6e90\uff09\uff0c\u800c adjtimex \u7684\u8c03\u6574\u4f1a\u8986\u76d6\u6b64\u6821\u51c6\u503c\uff0c\u76f4\u63a5\u5f71\u54cd gettimeofday \u7684\u8f6c\u6362\u903b\u8f91\u3002<\/p>\n<\/li>\n<hr>\n<h3>7.\u793a\u4f8b\u573a\u666f<\/h3>\n<ul>\n<li>\n<p>\u672a\u6821\u51c6\u7684 TSC\uff1a \u82e5 TSC \u9891\u7387\u6821\u51c6\u9519\u8bef\uff08\u4f8b\u5982\u5185\u6838\u8bef\u5224\u4e3a 3.0 GHz\uff0c\u5b9e\u9645\u662f 3.0001 GHz\uff09\uff0cgettimeofday \u8fd4\u56de\u7684\u65f6\u95f4\u4f1a\u9010\u6e10\u6f02\u79fb\u3002\u6b64\u65f6\u9700\u901a\u8fc7 adjtimex \u8c03\u6574\u9891\u7387\u8865\u507f\u53c2\u6570\uff0c\u4fee\u6b63\u6f02\u79fb\u3002<\/p>\n<\/li>\n<li>\n<p>\u6052\u5b9a TSC + adjtimex\uff1a \u5728\u652f\u6301\u6052\u5b9a TSC \u7684 CPU \u4e0a\uff0c\u7ed3\u5408 adjtimex \u7684\u5fae\u8c03\uff0cgettimeofday \u65e2\u80fd\u63d0\u4f9b\u9ad8\u5206\u8fa8\u7387\u7684\u65f6\u95f4\u95f4\u9694\u6d4b\u91cf\uff0c\u53c8\u80fd\u4fdd\u6301\u957f\u671f\u65f6\u95f4\u540c\u6b65\u3002<\/p>\n<\/li>\n<\/ul>\n<h2>\u4e8c.\u5b9e\u9a8c<\/h2>\n<h3>1.\u7528\u6709\u95ee\u9898\u7684NTP\u670d\u52a1\u5668\u6a21\u62df<\/h3>\n<p>cat <span class=\"token operator\">&gt;<\/span> ntp_srv<span class=\"token punctuation\">.<\/span>py <span class=\"token operator\">&lt;&lt;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token string\">\\&#8217;EOF\\&#8217;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> socket<br \/>\n<span class=\"token keyword\">import<\/span> struct<br \/>\n<span class=\"token keyword\">import<\/span> time<br \/>\n<span class=\"token keyword\">import<\/span> random<\/p>\n<p>NTP_PORT <span class=\"token operator\">=<\/span> <span class=\"token number\">123<\/span><\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">server<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    sock <span class=\"token operator\">=<\/span> socket<span class=\"token punctuation\">.<\/span>socket<span class=\"token punctuation\">(<\/span>socket<span class=\"token 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